FreeBSD/Linux Kernel Cross Reference
sys/fs/fuse/fuse_main.c

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 2007-2009 Google Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions are
      * met:
     *
     * * Redistributions of source code must retain the above copyright
     *   notice, this list of conditions and the following disclaimer.
     * * Redistributions in binary form must reproduce the above
     *   copyright notice, this list of conditions and the following disclaimer
     *   in the documentation and/or other materials provided with the
     *   distribution.
     * * Neither the name of Google Inc. nor the names of its
     *   contributors may be used to endorse or promote products derived from
     *   this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * Copyright (C) 2005 Csaba Henk.
     * All rights reserved.
     *
     * Copyright (c) 2019 The FreeBSD Foundation
     *
     * Portions of this software were developed by BFF Storage Systems, LLC under
     * sponsorship from the FreeBSD Foundation.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/types.h>
    #include <sys/module.h>
    #include <sys/systm.h>
    #include <sys/errno.h>
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/conf.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/queue.h>
    #include <sys/mount.h>
    #include <sys/vnode.h>
    #include <sys/stat.h>
    #include <sys/file.h>
    #include <sys/buf.h>
    #include <sys/sdt.h>
    #include <sys/sysctl.h>
    
    #include "fuse.h"
    #include "fuse_file.h"
    #include "fuse_ipc.h"
    #include "fuse_internal.h"
    #include "fuse_node.h"
    
    static void fuse_bringdown(eventhandler_tag eh_tag);
    static int fuse_loader(struct module *m, int what, void *arg);
    
    struct mtx fuse_mtx;
    
    extern struct vfsops fuse_vfsops;
    extern struct cdevsw fuse_cdevsw;
    extern struct vop_vector fuse_fifonops;
    extern int fuse_pbuf_freecnt;
    
   static struct vfsconf fuse_vfsconf = {
           .vfc_version = VFS_VERSION,
           .vfc_name = "fusefs",
           .vfc_vfsops = &fuse_vfsops,
           .vfc_typenum = -1,
           .vfc_flags = VFCF_JAIL | VFCF_SYNTHETIC
   };
   
   SYSCTL_NODE(_vfs, OID_AUTO, fusefs, CTLFLAG_RW, 0, "FUSE tunables");
   SYSCTL_NODE(_vfs_fusefs, OID_AUTO, stats, CTLFLAG_RW, 0, "FUSE statistics");
   SYSCTL_INT(_vfs_fusefs, OID_AUTO, kernelabi_major, CTLFLAG_RD,
       SYSCTL_NULL_INT_PTR, FUSE_KERNEL_VERSION, "FUSE kernel abi major version");
   SYSCTL_INT(_vfs_fusefs, OID_AUTO, kernelabi_minor, CTLFLAG_RD,
       SYSCTL_NULL_INT_PTR, FUSE_KERNEL_MINOR_VERSION, "FUSE kernel abi minor version");
   SDT_PROVIDER_DEFINE(fusefs);
   
   /******************************
    *
    * >>> Module management stuff
    *
    ******************************/
   
   static void
   fuse_bringdown(eventhandler_tag eh_tag)
   {
           fuse_node_destroy();
           fuse_internal_destroy();
           fuse_file_destroy();
           fuse_ipc_destroy();
           fuse_device_destroy();
           mtx_destroy(&fuse_mtx);
   }
   
   static int
   fuse_loader(struct module *m, int what, void *arg)
   {
           static eventhandler_tag eh_tag = NULL;
           int err = 0;
   
           switch (what) {
           case MOD_LOAD:                  /* kldload */
                   fuse_pbuf_freecnt = nswbuf / 2 + 1;
                   mtx_init(&fuse_mtx, "fuse_mtx", NULL, MTX_DEF);
                   err = fuse_device_init();
                   if (err) {
                           mtx_destroy(&fuse_mtx);
                           return (err);
                   }
                   fuse_ipc_init();
                   fuse_file_init();
                   fuse_internal_init();
                   fuse_node_init();
   
                   /* vfs_modevent ignores its first arg */
                   if ((err = vfs_modevent(NULL, what, &fuse_vfsconf)))
                           fuse_bringdown(eh_tag);
                   break;
           case MOD_UNLOAD:
                   if ((err = vfs_modevent(NULL, what, &fuse_vfsconf)))
                           return (err);
                   fuse_bringdown(eh_tag);
                   break;
           default:
                   return (EINVAL);
           }
   
           return (err);
   }
   
   /* Registering the module */
   
   static moduledata_t fuse_moddata = {
           "fusefs",
           fuse_loader,
           &fuse_vfsconf
   };
   
   DECLARE_MODULE(fusefs, fuse_moddata, SI_SUB_VFS, SI_ORDER_MIDDLE);
   MODULE_VERSION(fusefs, 1);

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